There is nothing wrong with you, and there are so many other girls like you. At one point I wanted my own child, but came to realise that it would be selfish of me to bring a child purposely into this world until I was older and in a better position financially and emotionally to raise him or her. I began going to councelling to find out why I felt to need to have a baby so young. It turned out to be because I was lonely, and felt like the only way I could get love was by having a baby but that isn’t true. I would advise you taking councelling aswell.
I ended up getting pregnant a year after I finished councelling by mistake, and trust me everyday is a huge challenge. Sure I wouldn’t trade it for anything, but if I could choose I’d wait until I was older. If you need to talk to someone feel free to message.